When adding sharing functionality to widgets there are usually 3 options: Clearspring, Gigya or custom. Assuming you don't want to go the custom route, its either Clearspring or Gigya (the companies actually have an almost equal share of the marketing).
Gigya is unfortunately not as "cool" as Clearspring, its verdana 11 point type and pixelated buttons don't have as much appeal to the Web 2.0 crowd. I often get asked by clients for some good examples of Clearspring widget but since they have only a limited number of widgets in they "featured" gallery (and since some widget, specially those for movies have a limited life span) it usually takes some time to find good examples. Here are examples is some widget categories:
Movies and TV Series Widgets
- High School Musical 3 (Movie Widget)
- Fox's Terminator (TV Series Widget)
- Indiana Jones "Kingdom of the Crystal Skull" (Movie Widget)
- Grey's Anatomy (TV Series Widget)
- Office Videos (TV Series Widget)
Bands and Music Artists Widgets
- Introspect Songcards (Music Artist Widget)
- Jonas Brothers Live Performance (Video Widget)
- Paula Abdul: Music Video (Video Widget)
- Linkin Park (Music Artist Widget)
- The Best of Radiohead (Music Artist Widget)
Non-Profit Widgets
- National Geographic Widgets (Various)
- Defeat Dementia (Advocacy Widget)
- CareYouKeep.com (Video Widget)
- Photo of the Day (Photo Widget)
Political and Government Widgets
- Legislative Failure to Act (Political Widget)
- FBI 10 Most Wanted (Government Widget)
- NY Times Election Results Widget (News Widget)
- Politico 44 President's Calendar (Events Widget)
- National Protest Against Prop 8 (Political Widget)
- My Debt to Labour (Political Widget)
Games and Puzzle Widgets
- Publisher's Clearning House Share & Win (Game Wiget)
- Gogo: The Game (Game Widget)
- The Office DVD (Game Widget)
- WashingtonPost.com's Photo Scrambler (Puzzle Widget)
Sports Widgets
- ESPN Mens Basketball Scoreboard (Sports Widget)
- The Official NFL Widget (Sports Widget)
- ABC Grandstand Cricket Kit (Sports News Widget)
- ESPN MLB Standings (Sports Widget)